Java, by nature of its moving GCs, can often do better with long running applications than languages like C and C++ which can much more easily suffer from inter

Java, by nature of its moving GCs, can often do better with long running applications than languages like C and C++ which can much more easily suffer from internal memory fragmentation. You can work around it by using tricks like memory pools, using a sophisticated malloc implementation, etc., but that all is much higher effort than with Java. Additionally, a lot of the systems you mentioned can often benefit from the sophistacted dynamic classloader the JVM provides. For something like Spark (mentioning this one because I am familiar with it), it is a requirement to load and run user specified code dynamically. You can do this in C, but the JVM makes this much easier.